/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 */ 
package org.apache.bcel.verifier.structurals;


import org.apache.bcel.Constants;
import org.apache.bcel.generic.ObjectType;
import org.apache.bcel.generic.ReferenceType;

/**
 * This class represents an uninitialized object type; see The Java
 * Virtual Machine Specification, Second Edition, page 147: 4.9.4 for
 * more details.
 *
 * @version $Id$
 * @author Enver Haase
 */
public class UninitializedObjectType extends ReferenceType implements Constants{

    private static final long serialVersionUID = -1228341777713117641L;
    /** The "initialized" version. */
    private ObjectType initialized;

    /** Creates a new instance. */
    public UninitializedObjectType(ObjectType t){
        super(T_UNKNOWN, "<UNINITIALIZED OBJECT OF TYPE '"+t.getClassName()+"'>");
        initialized = t;
    }

    /**
     * Returns the ObjectType of the same class as the one of the uninitialized object
     * represented by this UninitializedObjectType instance.
     */
    public ObjectType getInitialized(){
        return initialized;
    }

    /** @return a hash code value for the object.
     */
    @Override
    public int hashCode() { return initialized.hashCode(); }

    /**
     * Returns true on equality of this and o.
     * Equality means the ObjectType instances of "initialized"
     * equal one another in this and the o instance.
     *
     */
    @Override
    public boolean equals(Object o){
        if (! (o instanceof UninitializedObjectType)) {
            return false;
        }
        return initialized.equals(((UninitializedObjectType)o).initialized);
    }
}
